Joaquin “El Chapo” Guzman, who infamously escaped in 2001 from a high-security prison in a laundry cart, was arrested early Saturday in Mazatlan without a single shot being fired, authorities said.

A U.S. law enforcement official told CNN that Guzman, accompanied by a female, was captured in a joint operation of Mexican marines and U.S. Drug Enforcement Administration agents that was in the works for four or five weeks.

The pressure on Guzman’s organization, the Sinaloa cartel, had been mounting for months, with Mexican authorities killing or capturing several of its most brutal lieutenants, a U.S. law enforcement official said.

Those operations yielded information, including cell phone and other data, that helped Mexican authorities and U.S. drug enforcement agents track Guzman down.

Authorities were careful not to create a firefight considering Guzman was heavily armed. Apparently Guzman was moving between several homes and authorities seized “97 large guns, 36 handguns, two grenade launchers and a rocket launcher.”

El Chapo—who has a song in his honor courtesy of Gucci Mane—had been on the run for more than 12 years after escaping from prision. Some of the charges he will be facing include marijuana, cocaine and heroin trafficking along with conspiracy to commit murder and kidnapping.